Review reviewHigh

CVE-2023-4244

Linux Kernel, linux kernel, debian linux

A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to achieve local privilege escalation. Due to a race condition between nf_tables netlink control plane transaction and nft_set element garbage collection, it is possible to underflow the reference counter causing a use-after-free vulnerability. We recommend upgrading past commit 3e91b0ebd994635df2346353322ac51ce84ce6d8.

CVSS: 7
EPSS: -
CISA KEV: Not listed
Published: 2023.09.06

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability-

Technical severityCVSS 7

Vulnerability overview

Affected product and versions

Product: Linux Kernel, linux kernel, debian linux
Affected versions: >= 0.0 < 4.19.316, >= 4.20 < 5.4.262, >= 5.5 < 5.10.198, >= 5.11 < 5.15.134, >= 5.16 < 6.1.56, >= 6.2 < 6.4.11, < 4.19.316, >= 6.2.0 < 6.4.11, 10.0
Fixed versions: 4.19.316, 5.4.262, 5.10.198, 5.15.134, 6.1.56, 6.4.11

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that Linux Kernel, linux kernel, debian linux and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-416